Current
Time In (Punjab) India

General Specification:

NCT-BAR
LOCKS & RE-BAR COUPLERS

NCT Re-Bar Couplers are
designed to join the reinforcement bars. The
traditional method of connecting reinforcement bars with lap joints
continuity in reinforced concrete need not be always appropriate.
Advantages of simplicity and economy in lap splicing is limited to
smaller diameter bars. NCT mechanical couplers offer the solution for
splicing when large diameter bars are involved.

NCT
RE-BAR couplers increase production rates because of reduced
installation time and simpler quality control requirements. Because of
these differences, labour requirements and costs will be substantially
reduced.

Handling
the rebar in convenient sizes saves on valuable crane time. It
is economical to use couplers for higher diameter rebar as it saves on
considerable weight and rebar wastage. Special application for
micro-piling, piling, slope protection, pre-cast concrete,
slip-forming, formwork protection; top-down construction makes NCT
coupler as a part of any major project.

NCT
Standard Couplers are designed to join the reinforcement bars where at
least one of the bars could be rotated. The threaded design of coupler
helps easy engagement of the bar within the coupler with simple
alignment.

The
standard threaded coupler comprises of internally threaded sleeve
with two right handed threads tapering mid length of coupler. The bar
ends to be joined are saw cut and threading is provided on bar ends
with proprietary branded threading equipment and thread cutting
devices. The bars are connected initially by hand tightening and then
with pipe wrench (torque wrench may be preferred)

The
Re-BAR system provides butt joint when the bar threading
is fully engaged with coupler by appropriate tightening. The Re-BAR
Joining complies with BS-8110 Part 1, 1989 & BS-5400 Part 4,
1990 andACI-318.

The
NCT re-bar couplers are supplied with internal thread protection
plastic cap; The compact design of coupler ensures that no extra
concrete cover is demanded for coupler protection.

NCT
Transition Coupler

Transition
couplers are designed to join different diameter bars. The
tensile strength of the joints matches requirement for tensile failure
of smaller diamater bar.

Methods
and apparatus for making and assembling reliable NCT Re-bar couplers so
that a short up stand of rebar that protrudes from an existing concrete
structure can be connected to a new rebar at a retrofit work site out
in the field so as to provide a connection between a new and the
existing structure. According to a first embodiment, one end of the
protruding up stand is upset, and a threaded male coupling member
surrounds the protruding up stand behind the upset end thereof. The
threaded male coupling member is mated to a threaded female coupling
member that is affixed to the new rebar such that the upset end of the
up stand is retained between the male and female coupling members.
According to a second embodiment, one end of each of the protruding up
stand and the new rebar is upset, and a threaded male coupling member
surrounds the protruding up stand and the new rebar behind the
respective upset ends thereof. The threaded male coupling members are
then mated to opposite threaded ends of a NCT Re- BAR COUPLER female
member so that the upset ends of the protruding up stand and the new
rebar are retained at the interior of the female coupling member.

Installation
of NCT Re- Bar Couplers

Good
quality shear cut bars with sharp perpendicular cutting or saw cutting
may be used. The threading is provided on bar ends with proprietary
branded threading equipment and thread cutting tools.

Threading
of reinforcement bars must be carried out as per NCT RE-BAR COUPLERS by
trained operator. The thread checking gauge is used for checking the
threads. The threads shall be covered by thread protection plastic cap
while storing.

The
bent bars may be threaded on threading machine provided straight length
of the bent bar-end to be threaded is more than 0.5 m. If not so, the
bars may be threaded in straight lengths, connected thoroughly and bar
bending is carried out subsequently. The bent must be minimum 100mm
apart from thread bar end.

The
bar is connected to coupler sleeve initially by hand tightening and
then with pipe wrench.